Journal Article

FZJ-2024-03012

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Impact of competing energy scales on the shell-filling sequence in elliptic bilayer graphene quantum dots

Möller, S.RWTH* ; Banszerus, L.RWTH* ; Knothe, A. ; Valerius, L.RWTH* ; Hecker, K.RWTH* ; Icking, E.FZJ*RWTH* ; Watanabe, K. ; Taniguchi, T. ; Volk, C.FZJ* ; Stampfer, C. (Corresponding author)FZJ*

2023
Inst. Woodbury, NY

This record in other databases:  

Please use a persistent id in citations: doi:10.1103/PhysRevB.108.125128  doi:10.34734/FZJ-2024-03012

Abstract: We report on a detailed investigation of the shell-filling sequence in electrostatically defined elliptic bilayer graphene quantum dots (QDs) in the regime of low charge carrier occupation, N≤12, by means of magnetotransport spectroscopy and numerical calculations. We show the necessity of including both short-range electron-electron interaction and wave-function-dependent valley g-factors for understanding the overall fourfold shell-filling sequence. These factors lead to an additional energy splitting at half filling of each orbital state and different energy shifts in out-of-plane magnetic fields. Analysis of 31 different bilayer graphene (BLG) QDs reveals that both valley g-factor and electron-electron interaction-induced energy splitting increase with decreasing QD size, validating theory. However, we find that the electrostatic charging energy of such gate-defined QDs does not correlate consistently with their size, indicating complex electrostatics. These findings offer significant insights for future BLG QD devices and circuit designs.

---

Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)

Research Program(s):

1. 5222 - Exploratory Qubits (POF4-522) (POF4-522)
2. GrapheneCore3 - Graphene Flagship Core Project 3 (881603) (881603)
3. 2D4QT - 2D Materials for Quantum Technology (820254) (820254)
4. DFG project 390534769 - EXC 2004: Materie und Licht für Quanteninformation (ML4Q) (390534769) (390534769)

Appears in the scientific report 2024

---

Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---